Key to the species of Mesosaimia

1. Elytral basal swellings distinct (NE India)............................................. M. robusta Breuning, 1938

– Elytral basal swellings weak (Indochina).................................................................. 2

2. Pronotum with a pair of weak swellings on disk; female antennae surpassing elytral apices; elytra without distinct granules (N Vietnam)..................................................................... M. mausoni (Breuning, 1950)

– Pronotum with a pair of distinct swellings on disk; female antennae subequal or shorter than body; elytra with distinct granules near base............................................................................................. 3

3. Elytra mottled with brown, light brown, white and black pubescence (NE Laos).................. M. wakaharai, sp. nov.

– Elytra dominantly covered with whitish ocher pubescence in male, orange ocher pubescence in female (N Vietnam)....................................................................................... M. similis (Breuning, 1950)